When Mr. Satou, an employee at the world's largest electronics company, is asked by his boss to tutor the boss's only son in exchange for a prestigious promotion, things seem to be going smoothly. However, that perception is quickly shattered.
Satou soon discovers that his student is Ichirou Matsushita, a brilliant young boy harboring a terrifying hidden agenda. It doesn't take long for Satou to realize that he's the second home tutor in as many weeks to be tasked with teaching this enigmatic child. What's even more unsettling is that the previous tutor's whereabouts are shrouded in mystery.
The true identity of the young boy is unveiled when he places a curse on Satou, transforming him into a lizard man and forcing him into servitude. This boy, Ichirou Matsushita, is none other than the genius known as "Akuma-kun," a master of dark magic. His objective? To open a portal between hell and Earth, summon the most potent demons from the depths, and enlist their aid in a world-domination scheme!